EFFECT OF INOCULATION WITH PHOSPHATE-BACTERIA, SAWDUST COMPOST AND NITROGEN SOURCES ON OKRA YIELD AND SOME PROPERTIES OF A CALCAREOUS SOIL | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 8, Volume 27, Issue 6, June 2002, Page 4255-4266 PDF (3.85 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2002.255147 | ||||
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| Authors | ||||
| A.N. Estefanous1; Omaima M. sawan2 | ||||
| 1Agric. Microbiology Dept., Soil, Water and Environ. Res. Institute, ARC, .Giza, Egypt. | ||||
| 2Hort. Dept" National Research Center, Dokki, Cairo, Egypt. | ||||
| Abstract | ||||
| Two pot experiments were carried out during the seasons of 1999 and 2000 at Agricultural Research Center in ·Giza using a calcareous soil media to investigate the effect of phosphate dissolving bacteria (POE?) inoculation, sawdust compost and different nitrogen sources on growth and yield.of okra plants. Moreover, the changes in some . biological and chemical properties of the used soil after 175 days of planting were also recorded. 8acillus-megatherium var p < /em>hosp < /em>haticum was used as inoculum at the time of planting. While, two rates from sawdust compost were used, i.e. 2.5% and 5% in addition _ to the control treatment. The nitrogen fertilizer was added at four sources nam-ely, (8) nitric acid solution (0.1,ti), (C) nitric acid- calcium nitrate (1: 1) mixture, (D) calcium nitrate solution and' (E) urea solution on nitrogen basis compared with no mineral nitrogen application (A). The obtained results indicate that, inoculation of okra plants with POB and addition of sawdust compost significantly increased plant .growth, fruits yield and nutrients uptake. The highest increments of this parameter were. achieved. under usedhiqher compost rate (5%) than 2.5%. The obtained results show also that, nitrogen· fertilization: was very· important to okra plants in such soil . regardless the' form of added nitrogen. On the other hand, the completely and partially acidic' nitrogen form induced a positive effect on the availability of nutrients such as P and K which is reflected on uptake by plant fruits. Viable microbial counts, phosphate dissolving bacteria and dehydrogenase activity in the soil as well as the availability of mineral N, P and K were enhanced by organic manuring and inoculation with POB. Moreover, the addition of organic manure increased the organic matter percentage in the soil and lead to a slight decrease in its pH value. Therefore, adding sawdust compost to a calcareous soil in presence of acidic nitrogen fertilizer form as well as POB inoculation could be recommended to obtain the best results for okra fruits yield and favourable nutrients uptake. | ||||
| Keywords | ||||
| Phosphate-bacteria; Sawdust compost; Okra plant; Calcareous soil | ||||
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